Devices or disconnects for attended self-service motor fuel dispensing facilities must be what?

Devices or disconnects for attended self-service motor fuel dispensing facilities must be readily accessible to the attendant to ensure safety and proper operational control. This requirement is crucial because it allows the attendant to quickly and effectively respond to emergencies, such as equipment malfunctions or fuel spills, minimizing potential hazards.

Accessibility ensures that if a situation arises where the dispensing needs to be stopped immediately, the attendant can act promptly without searching for controls or devices that may be located far away or in an inconvenient position. This design fosters a safer environment for both the attendants and customers who are using the fuel dispensing facilities.

The other options suggest scenarios that would compromise safety and operational efficiency, as having devices out of sight or requiring complex operation could delay necessary actions in emergencies. Moreover, while devices can be manually operated or electronic, the key factor lies in their accessibility to the personnel responsible for managing the dispensing operations.